Seems to be making the point that it would be kind of dumb to spread across the solar system just making the other planets just as messed up as what we are currently doing on Earth.
There’s not so much to mess up on, say, Mars. I mean the terrain is interesting in its way but it’s not like we’d be annihilating complex ecosystems like we are here on earth. We would have to establish significant ecosystems anywhere we settled, in fact.
Honestly making all our corporate bullshit buildings on other barren planets would be way better than acting like a cancer on the ecosystem on earth. If we manage to become space fairing, I hope they can restore earth and reduce our spread on it. We don’t need concrete jungles.